Waxy hydrocarbons, paraffin or microcrystalline types, migrate to the surface of the elastomer forming a protective film at the rubber surface minimizing the effects of ozone. Measurement of the wax content is useful since its solubility is different in different elastomers or in the same elastomer with different fillers or plasticizer levels. (This test is not included with ARDL's standard or complete chemical analysis since it is not present in many cases.) It is reported and the parts per hundred of rubber hydrocarbon is estimated on the reconstructed formulation of ARDL's complete chemical analysis, if it is present.